Test data split between compiledJava tests and compiledKotlin tests

Basically, this commit splits test data from the from java-txt-kt to two pairs java-txt and kt-txt.
This commit leads to some duplication in test data.
This is temporary: in the platform types branch the test data for LoadJava tests will be changed dramatically, so duplication will go away

compiler/testData/loadJava/compiledJava/kotlinSignature/MethodWithVararg.java

@@ -0,0 +1,15 @@
+package test;
+
+import java.lang.String;
+import java.lang.UnsupportedOperationException;
+import java.util.*;
+import java.util.BitSet;
+import java.util.List;
+
+import jet.runtime.typeinfo.KotlinSignature;
+
+public class MethodWithVararg {
+    @KotlinSignature("fun foo(vararg s : String)")
+    public void foo(String... s) {
+    }
+}